Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b73ca3decc74c50…

MALICIOUS

PDF

38.0 KB Authoring application: Karbon
MD5: 9c0237189d99c8205eaf6d91d73445ae SHA-1: 74e711e5c98d3e640c6acf02f6fb9036b4fd349a SHA-256: 1b73ca3decc74c50b0f844ce695c78e668d328dc83e5a256ce18f2346862ff8b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of embedded URLs pointing to other PDF files, a technique often used for SEO manipulation or to distribute malicious content. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Guided reading groups 5th grade' which may be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://cfthomas.com/uploads/1/3/0/3/130379227/jowukuwumofefe.pdf
    • http://stayhererentals.com/uploads/1/3/0/5/130544086/60a378e72de546.pdf
    • http://promisewed.com/uploads/1/3/0/6/130640146/kudowirumifed.pdf
    • http://aclosbanos.com/uploads/1/3/0/5/130588654/pimewib.pdf
    • http://longplumbers.com/uploads/1/3/0/3/130313049/cf51d8284d7006a.pdf
    • http://thechopstickdiet.com/uploads/1/3/0/4/130436354/wapigovute-bitepa-sajumarezamegi-rutuv.pdf
    • http://bartolomeilaw.com/uploads/1/3/0/3/130379213/130379213.html#guided+reading+groups+5th+grade

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010eb.bin
bedca1ee56d24ca6e50862ae502eba10b2bb105ebeb229570f1c01ff3d1fcaa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB 8028 bytes

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